toolchain: LLVM 12.0.0
config: defconfig + kcsan.config
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BUG: KCSAN: data-race in capable / cgroup_freezer_migrate_task

write to 0xffff061797850e2c of 4 bytes by task 1882 on cpu 16:
 capable+0x6c/0x9c
 __do_sys_prctl+0x66c/0xe70
 __arm64_sys_prctl+0x68/0x80
 invoke_syscall+0x54/0x160
 el0_svc_common+0xc0/0x148
 do_el0_svc+0x38/0xa8
 el0_svc+0x20/0x50
 el0t_64_sync_handler+0x68/0xac
 el0t_64_sync+0x180/0x184

read to 0xffff061797850e2c of 4 bytes by task 1 on cpu 12:
 cgroup_freezer_migrate_task+0x3c/0x1a8
 cgroup_migrate_execute+0x22c/0x61c
 cgroup_migrate+0x240/0x264
 cgroup_attach_task+0xec/0x12c
 __cgroup1_procs_write+0x14c/0x1c4
 cgroup1_procs_write+0x14/0x20
 cgroup_file_write+0x10c/0x24c
 kernfs_fop_write_iter+0x144/0x20c
 vfs_write+0x468/0x59c
 ksys_write+0x9c/0x11c
 __arm64_sys_write+0x44/0x58
 invoke_syscall+0x54/0x160
 el0_svc_common+0x100/0x148
 do_el0_svc+0x38/0xa8
 el0_svc+0x20/0x50
 el0t_64_sync_handler+0x68/0xac
 el0t_64_sync+0x180/0x184
  
value changed: 0x00404040 -> 0x00404140
  
Reported by Kernel Concurrency Sanitizer on:
CPU: 12 PID: 1 Comm: systemd Not tainted 5.16.0-rc4-00002-g5854738642b4 #1
Hardware name: linux,dummy-virt (DT)
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